Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustion
Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a malformed padded HTTP/2 DATA frame. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
CVE-2026-111808
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-111808
Apache Traffic Server
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Apache Software Foundation",
"product": "Apache Traffic Server",
"versions": [
{
"status": "affected",
"version": "8.0.0",
"versionType": "semver",
"lessThanOrEqual": "8.1.11"
},
{
"status": "affected",
"version": "9.0.0",
"versionType": "semver",
"lessThanOrEqual": "9.2.15"
},
{
"status": "affected",
"version": "10.0.0",
"versionType": "semver",
"lessThanOrEqual": "10.1.4"
},
{
"status": "affected",
"version": "10.2.0",
"versionType": "semver"
}
],
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-111808
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #53259 · Revision 1
- Added to Heist Feed
- Publisher date